WATCH: One of the founding partners of Mossack Fonseca, the company at the heart of the Panama Papers scandal, says he is "amazed" nobody has described the leak of his company's documents as a "crime." Ramon Fonseca told Reuters he was "disappointed by modern investigative journalism."

One of the co-founders of the Panama-based law firm at the center of the massive document leak known as the Panama Papers has said the company was hacked from abroad.

Ramon Fonseca said the firm Mossack Fonseca lodged a criminal complaint with Panamanian prosecutors on April 4 over the breach.

He said there was evidence that the hacking was done from Europe but declined to give any details.

The huge document leak, published simultaneously by multiple news organizations in multiple languages on April 3, divulged details about the offshore holdings of a dozen current or former heads of states, celebrities, and sports stars.

Fonseca said his firm had committed no crimes and "at the end of this dust storm you will see this more clearly."